fix a bug in SetBinError (https://savannah.cern.ch/bugs/?44654)  now SetBinError enables the error calculation (i.e. calls Sumw2() ) if needed.
fix a bug in SetBinError (https://savannah.cern.ch/bugs/?44654)
 now SetBinError enables the error calculation (i.e. calls Sumw2() ) if needed.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@26506 27541ba8-7e3a-0410-8455-c3a389f83636

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